简述数控拉弯程序中位移的正负分别代表什么?
参考答案:
拉弯程序中的正位移代表液压缸收缩,负位移代表液压缸伸出。
My high school friend, I haven't seen for 20 years, is no longer ____ he was. [ ]
A. who, that
B. which, that
C. whom, what
D. that, what
水在烘烤食品中的作用有哪些?